build: Change version code schema to match Files/Talk, bump to 4.0.0

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

Author: AlvaroBrey

app/build.gradle

@@ -15,8 +15,8 @@ android {
         applicationId "it.niedermann.owncloud.notes"
         minSdkVersion 23
         targetSdkVersion 33
-        versionCode 3007001
-        versionName "3.7.1"
+        versionCode 40000000
+        versionName "4.0.0 Alpha 1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         javaCompileOptions {
             annotationProcessorOptions {